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For a while if I used /hop it would never work, one day I was going through the key binds in the options and I just bound the "accept redirect from server" to another key and it started working. I checked what the command is in console and it's "askconnect_accept". You could try manually binding it. Other than that I'm not sure exactly what fixed it for me, sorry :(
hey looking back on this thread it occured to me that what fixed it for me may have been switching HUDs. so maybe you could try that. sorry if I'm just giving you fixes that don't work haha I'm just trying to remember what did it for me. anyways maybe try switching to m0reHUD (the hud that I now use and may have fixed it) sorry again if this doesn't work but I know for a fact that changing my HUD allowed the /sync to show on bhop servers. so maybe just give m0reHUD a try.
I used to have sort of this problem with mge where the menu was cut off a little bit. Maybe if you try changing your resolution that could help? It fixed it for me